| abstract |
(57) 【Abstract】 PROBLEM TO BE SOLVED: To provide a polyethylene resin for pipes, which is excellent in rigidity, impact resistance and long-term durability under stress (environmental stress crack resistance property, hot internal pressure creep property of molded pipe). SOLUTION: A polyethylene resin for pipes, which is a linear polyethylene produced using a Ziegler-Natta catalyst and having the following physical properties (1) to (4). (1) Melt flow rate is 0.02 to 0.2 g / 10 Min (2) flow ratio (flow ratio) is 50 or more (3) density is 0.945 to 0.960 g / cm 3 (4) relaxation parameter H obtained by stress relaxation measurement Is less than 2.00 × 10 -8 dyn / cm 2 |